If you have been solving UPSC papers from 2020 onwards, you have probably noticed something. Questions on oceans, marine ecosystems, and coastal biodiversity are showing up with surprising regularity. This is not a coincidence — it reflects a global policy shift towards ocean governance, and UPSC is tracking that shift closely.
I have been teaching environment and ecology for over a decade, and I can tell you that understanding Marine Protected Areas (MPAs) and blue biodiversity is no longer optional. Let me walk you through everything you need — from the basics to exam-ready application.
Where This Topic Sits in the UPSC Syllabus
This topic straddles multiple papers. For Prelims, it falls under Environment and Ecology — specifically biodiversity and conservation. For Mains, it connects to GS-III under the broad heading of conservation, environmental pollution, and degradation. It also links to GS-II when international treaties and agreements on ocean governance come into play.
| Exam Stage | Paper | Syllabus Section |
|---|---|---|
| Prelims | General Studies | Environment and Ecology — Biodiversity and Conservation |
| Mains | GS-III | Conservation, Environmental Pollution and Degradation |
| Mains | GS-II | International Agreements and their Impact on India |
Since 2020, at least 8 to 10 questions across Prelims and Mains have touched upon marine ecosystems, coral reefs, mangroves in coastal zones, or international ocean agreements. The trend is clearly upward.
What Are Marine Protected Areas?
A Marine Protected Area is a clearly defined geographical space in the ocean where human activity is regulated to protect natural or cultural resources. Think of it like a national park, but underwater. The level of protection varies — some MPAs allow limited fishing, while others are strict no-take zones where no extraction is permitted.
The IUCN defines MPAs across different categories, from strictly protected marine reserves to areas that allow sustainable use. India currently has several MPAs, including the Gulf of Mannar Marine National Park, the Malvan Marine Sanctuary off Goa’s coast, and the Mahatma Gandhi Marine National Park in the Andaman Islands.
The global target, set under the Kunming-Montreal Global Biodiversity Framework (GBF) adopted in December 2022, is to protect 30% of the world’s land and ocean areas by 2030. This is called the 30×30 target. As of 2026, only about 8% of the global ocean is under some form of protection.
Understanding Blue Biodiversity
Blue biodiversity refers to the variety of life found in marine and coastal ecosystems. This includes everything from microscopic phytoplankton to large marine mammals like blue whales. Coral reefs, mangrove forests, seagrass beds, and deep-sea hydrothermal vents are all part of this category.
Why does UPSC care about this? Because India has a 7,516 km coastline, an Exclusive Economic Zone (EEZ) of over 2 million square kilometres, and nine coastal states and four union territories. Our blue economy — fisheries, shipping, offshore energy, tourism — depends directly on healthy marine ecosystems. Any threat to blue biodiversity is a threat to livelihoods.
Why UPSC Increased Focus After 2020
Several global and national developments between 2020 and 2026 explain this shift. The COVID-19 pandemic drew attention to zoonotic spillovers and biodiversity loss. The UN Decade of Ocean Science for Sustainable Development (2021-2030) was launched. The High Seas Treaty (BBNJ Agreement) was finalised in 2023 after nearly two decades of negotiations. India released its updated Blue Economy policy framework.
UPSC has always mirrored policy priorities. When the government focuses on something, the exam follows. The creation of the Deep Ocean Mission in 2021, increased budgetary allocation for marine research, and India’s active participation in CBD COP-15 all signalled to the exam-setters that this area deserves more questions.
Key Concepts You Must Know
Coral Bleaching occurs when corals expel the symbiotic algae (zooxanthellae) living in their tissues due to thermal stress. This turns corals white and can lead to death if the stress continues. India’s coral reefs in Lakshadweep and Andaman have experienced multiple bleaching events.
Mangroves are salt-tolerant trees found in coastal intertidal zones. India has about 4,992 sq km of mangrove cover (India State of Forest Report 2023). Sundarbans in West Bengal is the largest mangrove area. Mangroves act as carbon sinks, storm buffers, and fish nurseries.
Exclusive Economic Zone (EEZ) extends 200 nautical miles from a country’s baseline under UNCLOS. Within this zone, a country has sovereign rights over natural resources. Beyond the EEZ lies the high seas — and governance of biodiversity in these areas is what the BBNJ Treaty addresses.
BBNJ Treaty (High Seas Treaty) was adopted in June 2023. It provides a legal framework for establishing MPAs on the high seas, conducting environmental impact assessments, and sharing marine genetic resources equitably. India has signed but ratification is still under process as of 2026.
India’s Major Marine Protected Areas
India has designated several coastal and marine areas under different legal frameworks — the Wildlife Protection Act 1972, the Environment Protection Act 1986, and the CRZ Notifications. The Gulf of Mannar Biosphere Reserve in Tamil Nadu protects 21 islands and surrounding waters rich in coral diversity. The Gahirmatha Marine Sanctuary in Odisha is the world’s largest nesting ground for Olive Ridley sea turtles.
However, effective management remains a challenge. Many MPAs exist on paper but lack enforcement, monitoring infrastructure, and community involvement. This is a valid point to raise in Mains answers when discussing the gap between policy and implementation.
Previous Year UPSC Questions on This Topic
Q1. Consider the following: 1. Sea turtles 2. Seahorses 3. Sea cucumbers. Which of the above is/are protected under Schedule I of the Wildlife Protection Act, 1972?
(UPSC Prelims 2022 — GS)
Answer: All three are protected under Schedule I. Sea turtles (especially Olive Ridley), seahorses, and sea cucumbers have been listed due to overexploitation and ecological significance. Sea cucumbers play a key role in nutrient recycling on the ocean floor.
Explanation: This question tests awareness of marine species protection under Indian law. UPSC frequently asks about Schedule I and Schedule IV species. For marine biodiversity, remember that India banned sea cucumber harvesting completely in 2001.
Q2. Discuss the significance of the High Seas Treaty (BBNJ Agreement) for global ocean governance. How does it complement UNCLOS?
(UPSC Mains 2023 — GS-II, 15 marks)
Answer: The BBNJ Treaty fills a critical gap left by UNCLOS (1982), which did not adequately address biodiversity conservation beyond national jurisdictions. The treaty enables creation of MPAs on the high seas, mandates environmental impact assessments for activities in international waters, and establishes mechanisms for equitable sharing of benefits from marine genetic resources. It complements UNCLOS by providing the legal architecture that UNCLOS lacked for biodiversity governance. For developing nations like India, the treaty ensures that marine genetic resources — potentially valuable for pharmaceuticals and biotechnology — are not monopolised by technologically advanced nations.
Explanation: The examiner tests understanding of international environmental governance and India’s position. When answering, always connect the treaty to India’s interests — blue economy, pharmaceutical potential, and equity concerns.
Q3. Which of the following are coral reef areas in India? 1. Gulf of Kutch 2. Gulf of Mannar 3. Lakshadweep 4. Sundarbans
(UPSC Prelims 2020 — GS)
Answer: Options 1, 2, and 3 are correct. Sundarbans is a mangrove ecosystem, not a coral reef area. India has four major coral reef regions — Gulf of Kutch, Gulf of Mannar, Andaman and Nicobar Islands, and Lakshadweep.
Explanation: UPSC tests the ability to distinguish between different coastal ecosystems. Many aspirants confuse mangroves and coral reefs. Remember: corals need warm, shallow, clear water with sunlight. Sundarbans has turbid, sediment-rich water — not suitable for corals.
Key Points to Remember for UPSC
- India has four major coral reef regions: Gulf of Kutch, Gulf of Mannar, Andaman and Nicobar, and Lakshadweep.
- The 30×30 target under the Kunming-Montreal Framework aims to protect 30% of global land and ocean by 2030.
- The BBNJ Treaty (2023) is the first legally binding instrument for biodiversity conservation on the high seas.
- India’s EEZ covers over 2 million sq km — larger than many countries’ total land area.
- Gahirmatha in Odisha is the world’s largest Olive Ridley nesting site and India’s first marine sanctuary.
- Sea cucumbers, seahorses, and all sea turtles are protected under Schedule I of the Wildlife Protection Act.
- The Deep Ocean Mission (2021) focuses on deep-sea mining, biodiversity assessment, and underwater robotics.
Marine biodiversity is no longer a peripheral topic in UPSC preparation. It connects environment, international relations, governance, and economy in ways that make it ideal for both Prelims and Mains. I would recommend making a consolidated note covering India’s MPAs, international treaties (UNCLOS, CBD, BBNJ), and key marine species. Revise these alongside current affairs on ocean-related developments, and you will be well prepared for whatever the exam throws at you.